In all written media,like the on-line cartoon info & cable guide info. The name is spelled Silas.

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See the last ep. He even spells it. He made a pun of his name when he presents himself to Megatron. He says C-Y-L-A-S(as in CYborg), as an acronym for CYbernetic Life Augmented by Symbiosis instead of the usual spelling, Silas. Hope this clears it up^^

His original code name was Silas, but his real name was Corneal Leland Bishop. Then when he got infused with breakdown's body, he spun it around to make it the acronym CyLAS, which he spelled out before Megatron:
Cybernetic Life Augmented by Symbiosis.

His original code name was Silas, but his real name was Colonel Leland Bishop. Then when he got infused with breakdown's body, he spun it around to make it the acronym CyLAS, which he spelled out before Megatron:
Cybernetic Life Augmented by Symbiosis.